Corner unit for a picture frame



FIG. 1 is a front elevational view of a corner unit for a picture frame, showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is an isometric view thereof in the open position; and,

FIG. 8 is a front elevational view, the broken lines are for environmental purposes only and form no part of the claimed design. 

The ornamental design for corner unit for a picture frame, as shown and described. 